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What do base-LX, base-SX and base-FX mean respectively? What is the difference?

1, BASE-LX: transmission standard with long-wave laser as emission source and multimode fiber as carrier;

2. Base -SX: short-wave laser is used as the emission source, and both multimode fiber and single-mode fiber can be used;

3.BASE-FX supports 2-core multimode/single-mode fiber;